Belt-driving device for railway-carriage dynamos



March 399 N37" H. GUELLOU I BELT DRIVING nrsvxcs- FOR RAILWAY CARRIAGE DYNAMOS Filed Jan.28, 192s Patented Mar. 29,1927. i 1,522,315

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HENRI GILLOU, OF MONTBOUGE, FRANCE.

BELT-DRIVING DEVICE FOR'RAILWAY-CARRIAGE DYNAMOS. Application filed January 28, 1925, Serial No. 5,384, and in France January 28, 1924.

This invention relates to an improved belt sult being secured by means of two guide driving device for dynamos installed on the rollers which guide the belt and are so distrucks of railway or tramway. cars and posed that their peripheries are in tangential adapted to furnishthe electric current rerelation to the two median transverse and 5 .quired for the lighting of such cars or for longitudinal planes respectively of the pul- 60 other purposes. 4 leys of the axle and dynamo when in normal In the lighting devices of this type which position and because the axis of rotation of have been hi "herto constructed .and used, the dynamo would, if extended intersect the the dynamo has been connected to the truck axis of rotation of the driving axle.

by means of hinges and it'has been so ar- In the accompanying drawing .65 ranged as to have its axis of rotation at Figure 1 is a diagrammatic longitudinal right angles to the track, to. to the direc- .elevational view of the device showing how tion .in v hich the car travels. In such deit is suspendedv underneath the girders of vices the. dynamo: has driven directly the car.

through a driving belt froma. pulley Figure 2-is a diagrammatic plan view of 70 mounted on one axle of the can -The tensaid device illustratingin broken lines the sion of said belt has been obtained either respective positions assumed by the driving merely by'the effectof the horizontal force axle, driving pulley and belt when the car component resulting from the weight of the travels on curves of. the track.-

1 Y dynamo. which is hinged at a point spaced A designates the axis on which the dyna- .7

from its center ,of gravity, or else by the mo D is hinged or suspended underneath the action of a spring whose forcecould'be regframe; of the, car, said car having frame ulated. Such devices have-had the two folgirders L;.B designates the axis of revolulowing. disadvantages :-First-, the" suspention of the rotor of said dynamo. The said sion of the dynamo in the first mentioned axis, if prolonged would intersect the axis 80 position caused excessive variations of tenof rotation of the driving axle-E. As repsion on the belt when the speed of thecar resented, the belt'G passes over the driven was suddenly increased: or decreased owing convex pulley P mounted on and turning to the inertia of the dynamo. The belt withthe shaftof the dynamo. Said belt C was thus subjected to greatvst-resses, and it then passesover guide-rollers G, G laterally 85 often was either tornuoif or'so loosened that located above and below said pulley I and it dropped from thecpulley, even if the .it finally passes over a driving pulley or latter was provided with flanges. Secondly, drum T secured to the driving axle E. The

whenever the car traveled onacurve of-the median planesof said pulleys P and T are track, the driving axle assumed an'angular tangential to. the surfaces of rollers G G. position with respect to the axis of-rotation It is clear that, owing to the guiding action of the dynamo either in one. direction or of thetwo rollers G. G. the driving and another, the angle thus formed' generally bedriven sides of the belt will respectively. ening from 6 to 10, whereby,inasmuch as a gage the pulleys P and T constantly and ir- 40 transmission belt connecting non-parallel respective of the varying inclinations beshafts can only operate properly if its drivtween the driving axle and the dynamo shaft ing side always remains, in a perpendicular whenever the car travels on a curve of the plane to the shaft carryingthecorrespondtrack, whereby all risks of'the said belt being pulley, the operation ofthe belt was ing tor'n off-or dropping from the pulley P often unsatisfactory. y will be obviated. Moreover, all the obiec- According to the present invention a belt tionable variations in the tension of the belt driving device for railway or tramway car because of the inertia of the dynamo are dynamos is provided whichentirely obviates eliminated, and the required tension of the the aforesaid disadvantages. r r belt is neverthelessensured by the offset Briefly stated, this device is characterized weight of suspension of the dynamo so that W5 by the fact that the dynamo mounted on it is downwardly forced by gravity so as to hinges (as in prior devices) is so arranged tense the,belt.. a L. v p 1 x that its axis of rotation is maintained in As illustrated diagrammatically in Figure constant parallelism to the track, i. e. to the 2, whenever the car travels on a curve the direction of travel of the carriage, this reaxis of rotation of the driving axleE will as .tially vertical. turned, so that the axle E is turned around a 'vertical'line, the tension, position and driving force of the first belt sectioninterinedi- The rollers G and G are mounted in any suitable manner upon the frame of the car, independently of the trucks;'the.a :es and g of said rollers G and G"being substan- Hence. when the trucks are ate pulley T and rollers G, G are not substantially; change-d and the position and driving force of the second belt section intermediate-the rollers G, G" and dynamo pulley P are not changed. As I. claim that my invention is broadly neiv, I do not Wish to limit myself to a construction'in which the shafts of rollers G, G are exactly vertical,

and in which the axis of the dynamo'rotor is exactly aligned with the longitudinal'axis ot the car, since it is Within the limits of my invention if the arrangement and location of the partsbefore specified is substantially followed to anlextent' suliicient to maintain 'a drive'of the dynamo 'sufiiciently uniform for practical purposes when the speed of the car is increased ol decrjeasedyor if the car travels in a curved path. The rollers G and G may beconsidered as secondary driving means for the dynamo, said secondary driv- "ing'means being operated by the revolution of. the axle.

In accordance with the patent statutes, a

preferredembodiment of the invention has been described in theforegoing specification but it \vill be appreciated that modifications might be made therein without 'departing from the spiritand scope of the invention.

\Vhat I claim and desire to secure by Letters Patent is ljIn a drive for a dynamo connected to a railroad car or the like having trucks, the combination of means forconnecting said dynamo to said car independently of said trucks. secondary revoluble driving means for said dynamo spaced from the shaft of said dynamo. said secondary revoluble driving means being supported'from said lcar independently of said trucks, pr mary -rev oluble driving. means mounted on a truck and connected to and adapted to operate said secondary driving means, said secondary driving means being wholly free from any connection with said trucks save for their connection with said primary driving means the respective axes of revolution of said primary driving means and of said secondary driving meansgbeing non-parallel. 2. In a drivefor a dynamo connected to a railroad car or the like having trucks, the combination of means for connecting said dynamo to said car independently of said trucks, secondary pulley means supported from said car wholly independently of said trucks and mounted to revolve about a substantially vertical axis. and primary pulley means actuated by the revolution of the axle of one of said trucks and connected to the secondary pulley means by a belt said'seconda'ry pulley means being free from'the shaft of said dynamo and being connected to said shaft. 1 T i" A drive for a dynamo conneetedto a railroad car or the like having tri1cks,"comprising means vfor pivotally suspending said dynamo from the said car independentlyof said trucks and on a line substantially parallel to the longitudinal axis of said ear; said dynamo having a pulley, 'tivo' guiderollers connected to said ,car independently, of said trucks and 'adapted to turn'aroundfsubstantially vertical axes, bothsaid' rollers being laterally located with respect toj the, syn rri'o pulley and (m ne same-side thereof"on'e 0f said-rollers being locateddiigh'e said pulley and the other 'beingwlocated lower than said pulley. andeunv'e' pans located on the axle of one of said trucks, the said drive'pulley and rollersand dynamo pullev being adaptedto support single endless belt.

4. A drive according toolaim d in'ivhich the axis of revolution'ofthedynamdpulley substantially intersects the' axisof the 5. A drive according to'cl'aim 3 'in ivhich the central longitudinal plane otthummno pulley is substantially tangential to the periphery of the said'rollers.

6. In combination with a railroadcar or the like having trucks. a-d 'namo, means adapted to pivotally suspendsaid 'dyn'a'mo from said car independent of the trucks thereof so that said dynamdcan swing on a. line making an angle less than ninety degrees Withthe longitudinal axis of the car. a primary driving pulley on one of said trucks and'adapted' to be revolved by the revolution of the axle of said truck. and an endless belt drive intermediatesald primary driving pulley and the shaft of said dynamo, said endless belt drive including idler guide means connected to said cai independently of said trucks. 'v liave signed 'm' In testimony whereof I name to this specification.

H NR GIELLOU-i Certificate of Correction.

Patent No. 1,622,315. Granted March 29, 1927, to

HENRI GUILLOU.

It is hereby certified that errorappears in the above-numbered patent requiring correction as follows: In the heading to the printed specification, line 3, name of patentee, for Henri Gillou read H 677/; Gui-Haw; and that the said Lette1s"Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 19th day: of July, A. D. 1927.

[SEAL] M. J. MOORE,

Acting Commissioner of Patents. 

